P1A00 on 2013-2018 Ford C-Max — Motor Electronics Coolant Pump Performance
1 vehicles · 1 makes · $150-$5,000 repair
How to diagnose and fix P1A00: most-reported vehicles
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Ford C-Max · 2013–2018
The C-Max hybrid battery pack (lithium-ion in both the Hybrid and the Energi) can exhibit cell imbalance and capacity degradation, triggering the "Stop Safely Now" warning message. This disables the hybrid system and forces the vehicle into a reduced-power limp mode. The Energi plug-in uses a larger 7.6 kWh air-cooled lithium-ion pack than the Hybrid's 1.4 kWh pack. Ford's 8-year/100,000-mile battery warranty covers most failures, but out-of-warranty replacement is costly.
Common Symptoms
- "Stop Safely Now" warning message
- Hybrid system warning light illuminated
- Reduced EV-only driving range (Energi)
- Engine running more frequently than normal
- Battery charge gauge shows reduced capacity
How to Fix
If within the 8-year/100,000-mile warranty, have the dealer diagnose and replace under warranty. Out-of-warranty, independent hybrid shops can replace individual battery modules rather than the full pack for $1,500-3,000 vs $5,000+ for a full pack. The 12V auxiliary battery should be replaced first as a failed 12V battery can trigger false hybrid system warnings.
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Sources for this issue (3)
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P1A00 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P1A00 mean?
P1A00 stands for "Motor Electronics Coolant Pump Performance." This manufacturer-specific code refers to a performance problem with the motor electronics (inverter/converter) coolant pump on a hybrid or electric vehicle. The power electronics that drive the electric motor generate significant heat, and a dedicated electric coolant pump circulates coolant through them to keep them within safe temperatures. The computer monitors coolant flow and temperature, and when the pump isn't moving coolant adequately, it sets this performance code, which can lead to reduced power or limited hybrid operation to prevent overheating damage. The most common root is a weak or failed electric coolant pump, but air pockets, low coolant, or restrictions can also trigger it.
What are the most common causes of P1A00?
The most common causes of P1A00 are: Failed or weak motor electronics (inverter) coolant pump, Air pockets in the inverter cooling circuit (after service or leak), Low coolant level from a leak in hoses or reservoir, Blocked or restricted coolant passages/radiator, Contaminated or degraded coolant reducing flow/heat transfer, Damaged or corroded pump wiring/connector, Faulty coolant temperature sensor, Faulty hybrid/inverter control module (rare). The specific cause varies by vehicle.
How much does it cost to fix P1A00?
Repair costs for P1A00 range from $150 to $5,000, depending on the vehicle and root cause.
Which vehicles are affected by P1A00?
Au7o has documented P1A00 across 1 vehicle models from 1 manufacturers: Ford.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.